Diff: TARGET_MCU_NRF51822/sdk/source/ble/peer_manager/pm_buffer.c

Revision:

638:c90ae1400bf2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TARGET_MCU_NRF51822/sdk/source/ble/peer_manager/pm_buffer.c	Wed Sep 14 14:39:43 2016 +0100
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) Nordic Semiconductor ASA
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright notice, this
+ *   list of conditions and the following disclaimer in the documentation and/or
+ *   other materials provided with the distribution.
+ *
+ *   3. Neither the name of Nordic Semiconductor ASA nor the names of other
+ *   contributors to this software may be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#include "pm_buffer.h"
+
+#include <stdbool.h>
+#include <string.h>
+#include "nrf_error.h"
+#include "pm_mutex.h"
+
+
+#define BUFFER_IS_VALID(p_buffer) ((p_buffer != NULL)             \
+                                && (p_buffer->p_memory != NULL)   \
+                                && (p_buffer->p_mutex  != NULL))
+
+
+
+ret_code_t pm_buffer_init(pm_buffer_t * p_buffer,
+                          uint8_t     * p_buffer_memory,
+                          uint32_t      buffer_memory_size,
+                          uint8_t     * p_mutex_memory,
+                          uint32_t      mutex_memory_size,
+                          uint32_t      n_blocks,
+                          uint32_t      block_size)
+{
+    if (   (p_buffer           != NULL)
+        && (p_buffer_memory    != NULL)
+        && (p_mutex_memory     != NULL)
+        && (buffer_memory_size >= (n_blocks*block_size))
+        && (mutex_memory_size  >= MUTEX_STORAGE_SIZE(n_blocks))
+        && (n_blocks           != 0)
+        && (block_size         != 0))
+    {
+        p_buffer->p_memory   = p_buffer_memory;
+        p_buffer->p_mutex    = p_mutex_memory;
+        p_buffer->n_blocks   = n_blocks;
+        p_buffer->block_size = block_size;
+        pm_mutex_init(p_buffer->p_mutex, n_blocks);
+
+        return NRF_SUCCESS;
+    }
+    else
+    {
+        return NRF_ERROR_INVALID_PARAM;
+    }
+}
+
+
+uint8_t pm_buffer_block_acquire(pm_buffer_t * p_buffer, uint32_t n_blocks)
+{
+    if (!BUFFER_IS_VALID(p_buffer))
+    {
+        return ( BUFFER_INVALID_ID );
+    }
+
+    uint8_t first_locked_mutex = BUFFER_INVALID_ID;
+
+    for (uint8_t i = 0; i < p_buffer->n_blocks; i++)
+    {
+        if (pm_mutex_lock(p_buffer->p_mutex, i))
+        {
+            if (first_locked_mutex == BUFFER_INVALID_ID)
+            {
+                first_locked_mutex = i;
+            }
+            if ((i - first_locked_mutex + 1) == n_blocks)
+            {
+                return first_locked_mutex;
+            }
+        }
+        else if (first_locked_mutex != BUFFER_INVALID_ID)
+        {
+            for (uint8_t j = first_locked_mutex; j < i; j++)
+            {
+                pm_buffer_release(p_buffer, j);
+            }
+            first_locked_mutex = BUFFER_INVALID_ID;
+        }
+    }
+
+    return ( BUFFER_INVALID_ID );
+}
+
+
+uint8_t * pm_buffer_ptr_get(pm_buffer_t * p_buffer, uint8_t id)
+{
+    if (!BUFFER_IS_VALID(p_buffer))
+    {
+        return ( NULL );
+    }
+
+    if ( (id != BUFFER_INVALID_ID)
+    &&   pm_mutex_lock_status_get(p_buffer->p_mutex, id) )
+    {
+        return ( &p_buffer->p_memory[id*p_buffer->block_size] );
+    }
+    else
+    {
+        return ( NULL );
+    }
+}
+
+
+void pm_buffer_release(pm_buffer_t * p_buffer, uint8_t id)
+{
+    if (    BUFFER_IS_VALID(p_buffer)
+       &&  (id != BUFFER_INVALID_ID)
+       &&   pm_mutex_lock_status_get(p_buffer->p_mutex, id))
+    {
+        pm_mutex_unlock(p_buffer->p_mutex, id);
+    }
+}